Grinding machine



G. B. VERNON. GRINDING MACHINE.

APPLICATION FILED JULY10.1920.

Mtented Apr. My 1922.

v nu GEQRG'E E. Vmil', 0F PHILADELPHEA, PENNSYLVANA.

GRENDING MACHINE.

Specification of Letters Patent.

Patented Apr.. 11,

Application filed. July 10, 192)t Serial Ito. 395,216.

e ing stone-work, masonry, mar le and other surfaces;

The inventionv is particularly adapted for use on the walls of brick buildings and the like and in places where marble slabs are used to grind ofi worn or projecting surfaces and obtain a smooth, neat appearing finish. 'Still further the invention comprehends a grinding machine in which. a rapidly rotating abrasive member is employed for the cutting, grinding or polishing operation. To this end the machine is preferably power driven so that ythe rinding operation can be quickly and e ectively accomplished, thus doing away with the presentmethod of grinding the surfacesof bricks and the like and the sides and walls of buildings and which is now usually accomplished by hand.

In the further disclosure of the invention, reference is to be had to the accompanying drawings constituting a part of this specification, in which similar characters of reference denote corresponding partsin all the views, and in which,-

Figure 1 is an end view of the machine.

Figure 2 is a front view.

Figure 3 is a vertical sectional view taken on the line 3 3 in Figure 2, and

Figure 1.1 is a horizontal sectinnal view taken on the line lu-i in Figure 2.

Referring' more particularly to the views, l provide a box or casing 10, the front .11 of which is formed lwith an opening 12 through which projects a portion of an abrasive or polishing member 13 which may be in the nature of a buer or a grinding stone formed of carborundum or some other similar material. The box is provided at its rear with a handle 14 for the ready manipulation of the box so that it can he held against the wall of a building, bringing the surface of the member 13 in contact with the building.l The' rinding stone or member has a vertical s aft orspindle 15 passing therethrough and also through bearings 16 with suitable nuts 17 threaded on to the 'shaft to bear against the ends of the member 13 making the same rigid with the shaft so that it will rotate therewith. The washers 18, nuts 19 and lock nuts 20 are arranged u on a shaft to mount the same in the bearings 16- and the lower end of the shaft has connection through the medium of a coupling 21 with a flexible shating 22 connecting with a suitable motor 23, whereby the member 13 can be rapidly rotated. Within the box there is provided a guard 24 which serves to direct the dust produced in the grinding operation, toward an opening 25 in the lower part of the box and with which there is connected a hose 26 connecting with the motor 23, and preferably with a suction fan 27 driven/by a motor so that the dust or particles of stone or brick which are ground away by themember 13 will be carried oil to a suitable place of disposal. The baclr or rear side 28 of the box has tted therein a plurality of nuts 29 through which are threaded stems or rods 30, the outer ends of which carry suitable handles 31 and the inner ends of which are provided with heads 32 received in slots 33 in the bearings 16, the bearings in turn being arranged in slotted portions 3eof the box and formed also with plates 35 substantially covering the slotted portions of the box.

Now it will be apparent that when the operator places the box against the wall, he can by turningthe handles 31, move the grinding member toward or away from the surface. to be operated upon and can move one end of the grinding member slightly toward or away from the surface more than the other end by reason of the upper and lower adjusting screws and screw rods set out, it being of course very evident that the slight angularity of adjustment that might be desired as to the grinding member is almost infinitesimal and can be readily accomplished with the mounting set out.

It will readily beseen that by removing the vlocli nuts 20, nuts 19 and washers 18, that the bearings 16 can be removed so that the grinding member 13 can be taken out of 'the box when the hack 23 is removed in order .thatY the grinding member may be replaced by one of a liner or rougher quality or grade, or a louder may be employed in place of the abrasive member.

and described in this specilication, and that various slight changes may be made without departing from the spirit of the invention, the scope of which is defined in the appended claim..

Having described my invention, I claim A grinding machine comprising a easing, bearings adjustably mounted in the upper and lower walls of the casing, a shaft mounted in thebearings, a roller mounted on the shaft and normally retained in a vertical position during operation, permitting waste material to fall to the lower p0rtion of the easing, means for withdrawing said waste material by suction, and a curved element of sheet material, cooperating with one wall of the casing for enclosing the roller, 'the lower wall of said casing being provided with a segmental slot, the curvature of which conforms to the curvature of the roller and the curved element surrounding `the latter, the slot being in communication with the means for withdrawing waste material, said segmental -slot being positioned between the curved element and roller and producing an air current enveloping;l a' segment of the roller and moving longitudinally thereof from bottom to -top In 'testimony whereof I affix In signature.

GEORGE BV RNN. 

